Help towards a new powerchair

I am struggling with the powerchair I have, when it comes to public transport and storage, I have been trying to get a folding chair for a while but they are not within my means. I have £400 but the chair is £2900, it would mean the world to me if I was able to get this one, it would be easier to enjoy days out with family and even for use on trains and buses etc! I have patellar instability, Hypermobility, fibromyalgia, IBS, chronic migraines and autism, so anything that makes life just that bit easier to cope with is always welcome! I don't really know what to type in here except thank you to anyone who is able to help me!